General Samsung S21, S21+, and S21 Ultra U1 Firmware (Links)

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sketchscarz

Senior Member
Mar 2, 2011
225
95
Eugene
Samsung Galaxy S21 Ultra
Am I able to flash the U1 with odin? or another firmware that will get me back to bl v1? I do see its snapdragon which is me.

I jsut dont want to brick it. and make sure to back up with smart switch

also was trying to capture the OTA https://forum.xda-developers.com/t/...for-s21-plus-ultra-download-ota-link.4333487/ I know this is for exynos but i figured i could try andworkaround it and i jsut cant get the CA certificate to install from canary.

ive been looking up how to enable oem unlock through adb, but i get this error:

C:\Program Files (x86)\Tiny ADB and Fastboot>adb shell
p3q:/ $ am start -n com.android.settings/.DevelopmentSettings
Starting: Intent { cmp=com.android.settings/.DevelopmentSettings }
Error type 3
Error: Activity class {com.android.settings/com.android.settings.DevelopmentSettings} does not exist.
p3q:/ $

ADB Serial Number : R5CR92XSSFJ
Model Name : SM-G998U
Device CodeName : P3Q
Hardware : QCOM LAHAINA
Modem Board : SM8350
HW Version : REV1.0
BL version : G998USQS5BVA6
AP version : G998USQS5BVA6
CP version : G998USQS5BVA6,G998USQS5BVA6
CSC version : G998UOYN5BVA6
Android version : 12
Build date : Fri Jan 21 15:31:25 KST 2022
Country : USA
Serial Number : N/A
Carrier : VZW
SIM State : LOADED,NOT_READY [UNLOCKED]
Debug Level : 0x4f4c
CP Debug Level : 0x55FF
Warranty VOID : 0
SIM operator : Verizon , [311480,]
USB Settings : MTP,CONN_GADGET,ADB
 

sketchscarz

Senior Member
Mar 2, 2011
225
95
Eugene
Samsung Galaxy S21 Ultra
So i spoke with samsung technical support through chat and withdrew from the ui 4.0 beta program, which is something that is offered to you as a samsung customer. They said a rollback for snapdragon will be offered to us in future OTAs IF you withdraw from beta ui 4.0, and a bootloader unlock will be available, or you could go to a best buy or samdung store to get it flashed with their equipment. They also said beta UI 4.0 is possible to rollback to a backup through smart switch or flash with odin to u1 or version 1.
 
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sketchscarz

Senior Member
Mar 2, 2011
225
95
Eugene
Samsung Galaxy S21 Ultra
Screenshot_20220311-220102_Kiwi Browser.jpg


 

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sketchscarz

Senior Member
Mar 2, 2011
225
95
Eugene
Samsung Galaxy S21 Ultra
Will i lose the unlock and esim? Honestly, from what I've read, I may not even need to unlock bl. It runs fricking great and is really fast data.. I get like 90 MB/s.. And have got the 120 hz to not flicker by using adb tools.. It does not get hot at all, even when crypti mining with xmrig in termux. Debloated and dont have carrier bloat either. Only thing i need is a new screen it got cracked up in the right hand and bottom right corner. Super unfortunate but at least it's just the glass... Only reason I would need to root is to overclock because of the super slipstreamed system and battery life.. I bet u i can over clock somehow with adb function.
 

sketchscarz

Senior Member
Mar 2, 2011
225
95
Eugene
Samsung Galaxy S21 Ultra
Will i lose the unlock and esim? Honestly, from what I've read, I may not even need to unlock bl. It runs fricking great and is really fast data.. I get like 90 MB/s.. And have got the 120 hz to not flicker by using adb tools.. It does not get hot at all, even when crypti mining with xmrig in termux. Debloated and dont have carrier bloat either. Only thing i need is a new screen it got cracked up in the right hand and bottom right corner. Super unfortunate but at least it's just the glass... Only reason I would need to root is to overclock because of the super slipstreamed system and battery life.. I bet u i can over clock somehow with adb function.
Anyone know where to get a cheap screen replacement besides alibaba or Amazon?
 

Nicksr2016

New member
Mar 18, 2022
1
0
Chester
Have a Verizon branded 998U, phone is unlocked from carrier. When I try to insert a att sim in the device it's att locks my data on my sim with a data blocker. They tell me the imei is trying to register a 2g or 3g device. The wired thing is my esim imei shows att showsy.device is a s21 ultra. Is there anyways I can get this device to work on the att network. Att says they shut down 3g and there's no way around it. I was thinking of I flashed my s21 ultra with the unlocked version with that somehow get a different response when the imei tried to register on the att network? Any advice is greatly appreciated, I also have a s22 ultra but I would like to have my s21 ultra be able to work on either network being I have Verizon and att.
 

aimanfaeiz

Member
Feb 5, 2014
7
0
Hows
Hi,

This is the first time I'm trying to update Android phone manually. Reason is I'm from Malaysia and I imported the device from US as I prefer the snapdragon chip. However I found that I'm not able to update my device using OTA and I'm stuck at May 1 update.

Below is my device info. I'm new to this, so first question is can I flash this U1 firmware and second question is can get OTA for future updates once I flash to U1?

Thank you
What is the update? Do u get volte?
 

kelv_awesome

Member
Jun 14, 2014
13
1
Great.. can you share with me which firmware did you flash.. my s21 ultra got sm-998u1 model number and currently on one ui 4.1 but got no volte.. im confused which firmware should i flash.
We're on the same firmware I believe. I think it must be your carrier side.
 

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    After looking really hard ahead of launch for the U1 S21 Ultra Firmware using Samfirm and Frija, I couldn't find the US XAA firmware. Well I finally got a hold of it ahead of launch. You can use this firmware to flash any carrier branded S21, S21+, and S21 Ultra to U1 after receiving your device using Odin. Attached are the Google Drive links I've uploaded for your convenience. Links will be updated on a monthly basis for simplicity. Below is a simple guide on to flash this.

    Step 1: Download patched Odin and Firmware for the model that corresponds to your device's model number
    Patched Odin link:
    Download patched Odin and your phones firmware to an area on your computer that will be easy to access.

    If you do not have a program that can open rar files, then Winrar is a great program. Download link here

    Step 2: Download Samsung Smart Switch and make a complete backup of your entire device. Data will be wiped during this process, so make sure you have a complete backup.
    If Samsung Smart Switch says your device has an update, DO NOT UPDATE USING SMART SWITCH!
    Windows Link here: https://www.samsung.com/global/download/smartswitchwin/

    Step 3: Once your device is done backing up, Power off your device and put your device in download mode by pressing the Volume down button and power button at the same time. If you have done it correctly, your device should show this screen.
    samsung-download-mode-note-10.jpg

    Image Credit: Technastic.com

    Step 4: Connect your device to your computer and open up Odin.

    Step 5: Once Odin is opened, make sure your device is showing as connected, then select AP, and find your firmware file that you had extracted earlier, and select the one that says AP_(Your phones model), and do the same for every other one. So BL for BL, CP for CP, CSC for CSC, and USERDATA for USERDATA. Make sure you select the HOME CSC.

    Step 6: Click start. It will start to flash your U1 Firmware. Take a Tea break or something. Once its finished, it will automatically reboot.

    Step 7: Once device reboots, sign into your Gmail account you used previously, as well as your Samsung account. Once its at the home screen, restore the backup you made using Smart Switch and then once that completes, sign into all your apps. Your done. All OTA's now ill be XAA Samsung OTA's, not carrier branded ones.

    Step 8: Profit>?


    (S21 Firmware) SM-G991U1 Firmware - https://drive.google.com/file/d/1TdN9YZwTfi1O7UCqMU5TsgzkBlAw5le2/view?usp=sharing
    (S21+ 5G Firmware) SM-G996U1 Firmware - https://drive.google.com/file/d/1nsi_zZuxQok8J_MOdqDaroUz5TdG6kmU/view?usp=sharing
    (S21 Ultra Firmware) SM-G998U1 Firmware - https://drive.google.com/file/d/1Nwd_yEisW-AxnAUJAJBbJ1gQe91ED0z2/view?usp=sharing

    Enjoy and Happy Flashing
    Paypal Donation Link


    Questions and Answers

    Will this work for the Exynos version of the S21?
    No The provided firmware files are for the Snapdragon version. This might be compatible with the HK Snapdragon version, but I am not sure.

    Help, Odin won't flash, gives me an error.
    Respond in the comments below, and I'm sure we can get this to work.

    Will this unlock my phone from my carrier?

    No. If your device is locked before you flash this, it will be locked after you flash it. This is to remove carrier bloat and ensure all further updates will come from Samsung instead of your carrier. If you flash it before you unlock, you can still unlock your device as normal.

    I have bootloader unlocked my device, will this relock my bootloader?
    Yes. This includes the V2 bootloader for the S21 series, and as a result, if you flash this, you will lose your unlock token.

    Updated for Feb 2022 Security patches.
    1
    are these the QUALCOMM Versions?
    Yes. US U1 firmware
    1
    will this work with the T-Mobile version?
    This will work with any carrier branded version. It will entirely convert it from the carrier bloated version, to the U1 unlocked, Samsung version.
    1
    FYI - I found new firmware that includes February Security Patch for G998U1 - you can download it here: February Firmware for Galaxy S21 Ultra

    the firmware is for a region labeled as ACG (not sure who this is - but I do know that the firmware works on my ATT S21 Ultra with no problems)

    Hope this is helpful -